12 week old sexing help

I hatched Lily with a broody hen nearly 12 weeks ago. I've thought Pullet since the beginning until some beautiful coloring started to come in and the last few days where her tail feathers coming in are changing shape. I may be paranoid. She does not exhibit any Roo tendencies. Can you help me with her sex?

Background: Her dad is a full EE and her mom is a large, beautiful lavender orpington. When her mom was her age, she had a large comb and thick legs as well. Below are some pictures of her. Please help!